Skip to main content
'''Topaz''' is a silicate mineral of aluminium and fluorine with the chemical formula aluminium|Al2silicon|Sioxygen|O4(fluorine|F,hydroxide|OH)2. Topaz crystallizes in the orthorhombic system, and its crystals are mostly prismatic terminated by pyramidal and other faces.
CategorySilicate mineral
Boxwidth| boxbgcolor =
Imagesize180xp
FormulaAl2SiO4(F,OH)2
Strunz9.AF.35
SymmetryOrthorhombic dipyramidal
H-M symbol: (2/m 2/m 2/m)
Space group: Pbnm
ColorColorless (if no impurities), blue, brown, orange, gray, yellow, green, pink and reddish pink
SystemOrthorhombic
HabitPrismatic crystals with faces striated parallel to long dimension; also columnar, compact, massive
Twinning| cleavage = [001] Perfect
share Share
favorite Favorite
SHOW DETAILS
up-solid down-solid